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NEEED HELP PLSSSS . Find x in triangles Geometry.

NEEED HELP PLSSSS . Find x in triangles Geometry.-example-1
User Jlocker
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Answer:

  • 10) x = 76,
  • 12) x = 8, Perimeter = 77 units

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Question 10

The triangle is isosceles as marked.

The two opposite angles of equal sides are equal, one of them is x and the angle in between them is 28°.

Use angle sum of the triangle:

  • 2x + 28 = 180
  • 2x = 152
  • x = 76

Question 12

Same as previous question, we have an isosceles triangle. Equal sides are:

  • 3x + 5 = 5x - 11
  • 5x - 3x = 5 + 11
  • 2x = 16
  • x = 8

Find the perimeter by substituting the value of x:

  • P = 3*8 + 5 + 5*8 - 11 + 2*8 + 3 = 77 units

User Hoang Hiep
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